> Note that the point on raster overlay can be beaten easily for speed by > the extract function in the R raster package. However the polygon overlays > are now very fast and compare well with any alternative way of getting the > result. Using PLR to run R functions within PostGIS is great if you want > medians, quartiles etc or any other derived property. > > I wonder what is going on to make the point on raster overlay in PostGIS slower than in R. I'd have expected the numbers to be about the same as that operation is conceptually very simple.
-bborie
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